Re-installing a TouchTone keypad in an ASR-33

Hi, All, I know I've mentioned this long-outstanding project before, but just this week, I've had a couple of nudges towards getting it done... First, Will Donzelli stopped by on his Eastward Progress to deliver some PDP-8 gear to me, and in the process of showing him around my Farm, I pointed out this ASR-33 w/110 bps modem in the pedestal. Second, I just found the box of telephone parts with two pre-IC-era touchtone keypads, one of which I'm positive I removed from the TTY years ago when I was tearing it apart (in ignorance) to attempt to remove the modem, etc., and make it a viable console TTY for my (first) PDP-8/L. So... what I still lack is proper documentation to know how to install the TouchTone pads. I'm thinking it'll be much easier these days to find a PDF than it ever would have to find real paper in the 1980s when I bought the TTY at Dayton. My question (for now) is... how I can tell which of these two keypads is likely to be the right unit. They are superficially identical, but one has 7 wires, the other 11 as follows... Both: Green, Red, Black, White, Blue/White, Black/Orange, Red/Green One: Purple, Blue, Orange, White/Green There is what appears to be a date-code on the bobbin transformers on the 7-wire pad of 3-77 vs 12-80 on the 11-wire pad. If that _is_ a date code, I'd wager the 3-77 unit is from the ASR-33 simply because I don't think I would have been able to pick up a 3-4-year-old ASR-33 at Dayton for $35 or so, but I can believe that a 7-8-year-old unit could have been that cheap. OTOH, I can see how a data device might need a more complicated keypad (there appear to be additional levels of switches compared to the simpler one, thus it suggests where the extra 4 wires are going). I'm thinking that I probably just loosened the screw terminals in the ASR-33 and removed the keypad to either get it out of the way or because I thought I might recycle it into something else. Now, give that I know there are differences other than the modem in the one TTY, I'm probably unlikely to attempt to convert it to a 6-wire console-capable TTY, and would like to restore the modem-equipped TTY to its original functionality. Does anyone on the list know of a good resource for 1970s-1980s telephone techology that is available (i.e., not something that Western Electric/Lucent is sitting on that's for internal use only)? I have PDFs for the mechanical bits of an ASR-33; those have been floating around for some time (and I have them on paper, too, that came with my console-capable TTY). I lack any modem-equipped-model-specific docs. Those would be most helpful, as I could reinstall the TouchTone pad in a few minutes once I knew what wires go where. Thanks for any tips and pointers. -ethan